/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.bluetooth.le;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.app.Activity;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;

import com.ajie.slimming.R;

/**
 * For a given BLE device, this Activity provides the user interface to connect,
 * display data, and display GATT services and characteristics supported by the
 * device. The Activity communicates with {@code BluetoothLeService}, which in
 * turn interacts with the Bluetooth LE API.
 */
public class DeviceControlActivity extends Activity
{
    private final static String TAG = DeviceControlActivity.class.getSimpleName();
    
    public static final String EXTRAS_DEVICE_NAME = "DEVICE_NAME";
    
    public static final String EXTRAS_DEVICE_ADDRESS = "DEVICE_ADDRESS";
    
    private TextView mConnectionState;
    
    private TextView mDataField;
    
    private String mDeviceName;
    
    private String mDeviceAddress;
    
    private ExpandableListView mGattServicesList;
    
    private BluetoothLeService mBluetoothLeService;
    
    private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>();
    
    private boolean mConnected = false;
    
    private BluetoothGattCharacteristic mNotifyCharacteristic;
    
    private final String LIST_NAME = "NAME";
    
    private final String LIST_UUID = "UUID";
    
    private String resultData = "";
    
    // Code to manage Service lifecycle.
    private final ServiceConnection mServiceConnection = new ServiceConnection()
    {
        
        @Override
        public void onServiceConnected(ComponentName componentName,
                IBinder service)
        {
            mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
            if (!mBluetoothLeService.initialize())
            {
                Log.e(TAG, "Unable to initialize Bluetooth");
                finish();
            }
            // Automatically connects to the device upon successful start-up initialization.
            mBluetoothLeService.connect(mDeviceAddress);
        }
        
        @Override
        public void onServiceDisconnected(ComponentName componentName)
        {
            mBluetoothLeService = null;
        }
    };
    
    // Handles various events fired by the Service.
    // ACTION_GATT_CONNECTED: connected to a GATT server.
    // ACTION_GATT_DISCONNECTED: disconnected from a GATT server.
    // ACTION_GATT_SERVICES_DISCOVERED: discovered GATT services.
    // ACTION_DATA_AVAILABLE: received data from the device.  This can be a result of read
    //                        or notification operations.
    private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver()
    {
        @Override
        public void onReceive(Context context, Intent intent)
        {
            final String action = intent.getAction();
            if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action))
            {
                mConnected = true;
                updateConnectionState(R.string.connected);
                invalidateOptionsMenu();
            }
            else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action))
            {
                mConnected = false;
                updateConnectionState(R.string.disconnected);
                invalidateOptionsMenu();
                clearUI();
            }
            else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action))
            {
                // Show all the supported services and characteristics on the user interface.
                displayGattServices(mBluetoothLeService.getSupportedGattServices());
            }
            else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action))
            {
                displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
            }
        }
    };
    
    // If a given GATT characteristic is selected, check for supported features.  This sample
    // demonstrates 'Read' and 'Notify' features.  See
    // http://d.android.com/reference/android/bluetooth/BluetoothGatt.html for the complete
    // list of supported characteristic features.
    private final ExpandableListView.OnChildClickListener servicesListClickListner = new ExpandableListView.OnChildClickListener()
    {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id)
        {
            if (mGattCharacteristics != null)
            {
                final BluetoothGattCharacteristic characteristic = mGattCharacteristics.get(groupPosition)
                        .get(childPosition);
                final int charaProp = characteristic.getProperties();
                if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0)
                {
                    // If there is an active notification on a characteristic, clear
                    // it first so it doesn't update the data field on the user interface.
                    if (mNotifyCharacteristic != null)
                    {
                        mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic,
                                false);
                        mNotifyCharacteristic = null;
                    }
                    mBluetoothLeService.readCharacteristic(characteristic);
                }
                if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0)
                {
                    mNotifyCharacteristic = characteristic;
                    mBluetoothLeService.setCharacteristicNotification(characteristic,
                            true);
                }
                return true;
            }
            return false;
        }
    };
    
    private void clearUI()
    {
        mGattServicesList.setAdapter((SimpleExpandableListAdapter) null);
        mDataField.setText(R.string.no_data);
    }
    
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.gatt_services_characteristics);
        
        final Intent intent = getIntent();
        mDeviceName = intent.getStringExtra(EXTRAS_DEVICE_NAME);
        mDeviceAddress = intent.getStringExtra(EXTRAS_DEVICE_ADDRESS);
        
        // Sets up UI references.
        ((TextView) findViewById(R.id.device_address)).setText(mDeviceAddress);
        mGattServicesList = (ExpandableListView) findViewById(R.id.gatt_services_list);
        //mGattServicesList.setOnChildClickListener(servicesListClickListner);
        mConnectionState = (TextView) findViewById(R.id.connection_state);
        mDataField = (TextView) findViewById(R.id.data_value);
        
        getActionBar().setTitle(mDeviceName);
        getActionBar().setDisplayHomeAsUpEnabled(true);
        
        Intent gattServiceIntent = new Intent(this, BluetoothLeService.class);
        bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);
    }
    
    @Override
    protected void onResume()
    {
        super.onResume();
        registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());
        if (mBluetoothLeService != null)
        {
            final boolean result = mBluetoothLeService.connect(mDeviceAddress);
            Log.d(TAG, "Connect request result=" + result);
        }
    }
    
    @Override
    protected void onPause()
    {
        super.onPause();
        unregisterReceiver(mGattUpdateReceiver);
    }
    
    @Override
    protected void onDestroy()
    {
        super.onDestroy();
        unbindService(mServiceConnection);
        mBluetoothLeService = null;
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.gatt_services, menu);
        if (mConnected)
        {
            menu.findItem(R.id.menu_connect).setVisible(false);
            menu.findItem(R.id.menu_disconnect).setVisible(true);
        }
        else
        {
            menu.findItem(R.id.menu_connect).setVisible(true);
            menu.findItem(R.id.menu_disconnect).setVisible(false);
        }
        return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        switch (item.getItemId())
        {
            case R.id.menu_connect:
                mBluetoothLeService.connect(mDeviceAddress);
                return true;
            case R.id.menu_disconnect:
                mBluetoothLeService.disconnect();
                return true;
            case android.R.id.home:
                onBackPressed();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
    
    private void updateConnectionState(final int resourceId)
    {
        runOnUiThread(new Runnable()
        {
            @Override
            public void run()
            {
                mConnectionState.setText(resourceId);
            }
        });
    }
    
    private void displayData(String data)
    {
        if (data != null)
        {
            resultData += data;
            mDataField.setText("收到的数据为:" + resultData);
        }
    }
    
    private void prase(String data)
    {
        String split[] = data.split(" ");
        
    }
    
    // Demonstrates how to iterate through the supported GATT Services/Characteristics.
    // In this sample, we populate the data structure that is bound to the ExpandableListView
    // on the UI.
    private void displayGattServices(List<BluetoothGattService> gattServices)
    {
        if (gattServices == null)
            return;
        String uuid = null;
        //String unknownServiceString = getResources().getString(R.string.unknown_service);
        //String unknownCharaString = getResources().getString(R.string.unknown_characteristic);
        //所有的service的name和uuid的信息的集合
        //ArrayList<HashMap<String, String>> gattServiceData = new ArrayList<HashMap<String, String>>();
        //所有的service里面的Characteristic数据集合
        //ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData = new ArrayList<ArrayList<HashMap<String, String>>>();
        //mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>();
        
        // Loops through available GATT Services.
        for (BluetoothGattService gattService : gattServices)
        {
            //HashMap<String, String> currentServiceData = new HashMap<String, String>();
            //uuid = gattService.getUuid().toString();
            //currentServiceData.put(LIST_NAME,
            //        SampleGattAttributes.lookup(uuid, unknownServiceString));
            //currentServiceData.put(LIST_UUID, uuid);
            //gattServiceData.add(currentServiceData);
            
            //ArrayList<HashMap<String, String>> gattCharacteristicGroupData = new ArrayList<HashMap<String, String>>();
            List<BluetoothGattCharacteristic> gattCharacteristics = gattService.getCharacteristics();
            //ArrayList<BluetoothGattCharacteristic> charas = new ArrayList<BluetoothGattCharacteristic>();
            
            // Loops through available Characteristics.
            for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics)
            {
                handleCharacteristic(gattCharacteristic);
                //charas.add(gattCharacteristic);
                //HashMap<String, String> currentCharaData = new HashMap<String, String>();
                //uuid = gattCharacteristic.getUuid().toString();
                //currentCharaData.put(LIST_NAME,
                //        SampleGattAttributes.lookup(uuid, unknownCharaString));
                //currentCharaData.put(LIST_UUID, uuid);
                //gattCharacteristicGroupData.add(currentCharaData);
            }
            //mGattCharacteristics.add(charas);
            //gattCharacteristicData.add(gattCharacteristicGroupData);
        }
        
        //SimpleExpandableListAdapter gattServiceAdapter = new SimpleExpandableListAdapter(
        //                this, gattServiceData,
        //                android.R.layout.simple_expandable_list_item_2, new String[] {
        //                        LIST_NAME, LIST_UUID }, new int[] { android.R.id.text1,
        //                        android.R.id.text2 }, gattCharacteristicData,
        //                android.R.layout.simple_expandable_list_item_2, new String[] {
        //                        LIST_NAME, LIST_UUID }, new int[] { android.R.id.text1,
        //                        android.R.id.text2 });
        //        mGattServicesList.setAdapter(gattServiceAdapter);
    }
    
    private void handleCharacteristic(BluetoothGattCharacteristic characteristic)
    {
        final int charaProp = characteristic.getProperties();
        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0)
        {
            // If there is an active notification on a characteristic, clear
            // it first so it doesn't update the data field on the user interface.
            if (mNotifyCharacteristic != null)
            {
                mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic,
                        false);
                mNotifyCharacteristic = null;
            }
            mBluetoothLeService.readCharacteristic(characteristic);
        }
        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_NOTIFY) > 0)
        {
            mNotifyCharacteristic = characteristic;
            mBluetoothLeService.setCharacteristicNotification(characteristic,
                    true);
        }
    }
    
    private static IntentFilter makeGattUpdateIntentFilter()
    {
        final IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
        intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
        intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
        return intentFilter;
    }
}
